Improvement in saving-machines



HENRY P. OHM.

Improvement in 'Sawing Machines.

' No. 123,723. .Patented Feb-13,1872

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PATENT OFFICE.

HENRY P. OHM, OF BALTIMORE, MARYLAND.

IMPROVEMENT IN SAWING-MACHINES.

Specification forming part of Letters Patent No. 123,723, dated February 13, 1872.

Speciiication describing certain Improvements in Sawing-Machines, invented by HEN- BY P. OHM, of Baltimore, in the county of Baltimore and State of Maryland.

Figure 1 is a plan view of the machine. Fig.

. 2 is a side elevation view of the same.

This invention relates to an improvement in lportable sawing-machines, intended especially for Working up lumber and performing other light Work', but also equally applicable for cross-cutting logs, &c. and the invention consists mainly in an apparatus for feeding the lumber to the saw, and in the manner in which Vthe driving power is applied to the latter, as

will be hereinafter more fully described.

Referring to the drawing, A represents an up.- right frame, which carries the operative mechv anism of the machine,-and forms, in connection with the detachable leaf or board B, a table upon which the Wood is fed. C is a cirv cular saw, which is detachably attached to its shaft D, so that it may be interchanged with saws having different-shaped teeth, to render the machine capable of performing various kinds of Work. The saw-shaft D has its bearings in journals located respectively at one side and near the center of the frame, and its `inner end is provided With a screw-threaded portion that projects from the journal, sothat tha saws may be attached without removing the shaft from its bearings, by simply detaching a nut on the end of the shaft. Eis a small pinion, attached to the opposite end of the saw-shaft and gearing with a larger pinion, F, that in turn gears with a pinion-Wheel, G, on the shaft H, to which the driving power is applied by a crank or otherwise. The pinion F is attached to an intermediate shaft L, carrynecting-rods. P" P' are arms pivoted in slotted plates Q Q', attached on opposite sides of the rock-shaft. R R' are bifurcated pawls secured to the lower ends of said arms and engaging with the ratchet-Wheels S S on the shaft S", which latter carries a feed-roller, T, armed with a ronr of teeth, T', and a portion of Whose periphery projects through a slot in j the saw-table. v The operation of said feed-roller is as fol-y lows, viz: By the revolution of the saw-shaft a vibratory motion is imparted to the rockshaft through the medium of the crank and connecting-rod, and by such movement a continuous revolution ofthe feed-roller T is eii'ected through the pawls by reason of their alternate action upon the ratchet-wheels, which latter action is produced by their attachment on opposite sides of the rock-shaft.

U is a small pressure-roller, which is attached to a curved arm, U', that is capable of being adjusted vertically and laterally, and

of being `entirely detached from the machine. Said roller bears upon the upper surface of the Wood and holds it in contact with the feed-roller T, so that the feeding of the lumber shall be Without interruption. V is a laterally-adjustable gauge for the lumber,l provided with arms V' V', which pass through slots in the vertical bars W, and are held in any desired position by set-screws. vX'

represents a guide-roller, located at one end of the frame, and which is revolved by the frictional contact of the lumber passing over the same. Y is a small roller, attached to anarm, constructed and applied in the same manner as that of the pressure-roller, and intended to bear against the edge of the lumber and prevent the lateral movement of the same.

Having thus described my invention, what I claim as new, and desire to secure by Letters 

